Migiah walkee



M. WALKER.

(ModeL) PUMP,

N4 PEYERS. Huololilhugmphur. Waslinglolk D4 C.

UNITED STATES PATENT OFFICE.

MIOIAH WALKER, OF PORT HURON, MICHIGAN.

PUMP.

SPECIFICATION forming part of Letters Patent No. 250,178, dated November29, 1881.

Application filed July 8, 1881. (Motleh) To all whom "it may concern Beit known that I, MIGIAH WALKER, of Port Huron, in the county of St.Clair and State of Michigan, have invented an Improvement inSteam-Pumps, of which the following is a specification.

The nature of this invention relates to certain new and usefulimprovements in the construction of that class of pumps known asdisplacement-pumps, for lifting and forcing water; and the inventionconsists in the peculiar construction and operation of its parts andtheir combination, as more fully hereinafter set forth.

Figure l is a vertical longitudinal section. Fig. 2 is a verticalcross-section on the line X Xin Fig.1. Fig. 3 is an enlarged anddetached perspective view of one of the valve-rin gs. Fig.

vc-is a vertical cross-section of the pump-chamber on the lines 4 4.Fig. 5 is a perspective of one of the flexible valves detached.

1n the accompanying drawings, which form a part of this specification, Arepresents the shell, provided with beads B, one of which is providedwith the stuffing box 0, through which the piston-rod D has itsreciprocating motion.

E is the inlet or suction opening, through which the water is admittedinto the pumpbarrel, located on one side of the shell, and immediatelyopposite is another opening, F, communicating with vacuum-chamber G.

H represents the walls of the pump-chamher proper, made inring-sections, as shown. These sections are secured at their inner endsto a central annular bridge, I, the bore through the same being of theproper size to allow for the free reciprocation of the plunger throughit. This annular ring-support is provided with packing a, secured inplace by the bolt and flange b. The walls H are made in tworingsections, as shown, one being secured to each side of the bridge byscrew-threads or otherwise, so as to form tight joints. The outer endsof these walls H, which form the inlet portion of the piston-chamber,are secured to the internally-projecting annular flanges c and c, whichare integral parts of the shell; and the chamber thus formed by theflanges c c and the wall of the shell A forms the inlet waterchamberwithin the shell, and has communication with the suction-opening E.These rings H are provided around their periphery with inlet-ports eindouble rows, and a double valve,

J, secured at its center by means of bolts ff to the abutments betweenthe ports 0, so that two rows of ports are covered, each row by one wingof the valve J, which valves open inwardly at proper times to admitwater into the piston-chamber K. In each of the abutments between theinlet-ports care recesses 9, designed to form receptacles for silt orfine sand, which might otherwise collect under the faces of the valvesand prevent their successful operation. Secured between the heads B ofthe shell and the outer ends of the walls H are the rings L, the innerends of which are provided with flanges h, by means of which they aresecured by any convenient devices to the flanges cand 0'. These ringsare provided with ports i in double rows, to which are secured valves J,opening outwardly, constructed precisely like valves J, and similarlysecured to the valve-rings L. Between these rows of ports 11, andimmediately under the center of the valve J, is a recess, g, for a likepurpose with that of the recesses g in the'rings H, and as theserecesses are opened at their outer ends the sand or silt collected inthem is forced out by the rush of the waters. These rings L, togetherwith the rings H and the heads of the shell B, form the pump-chamberproper, and the rings L have communication outwardly through the valvesJ into the chamber M, between the heads B, the shell A, and the flangesc c and wall 01, which chamber has a free communication with theair-chamber N, near the lower end of which is situated the outlet 0.

P is the piston, formed of the shell k and the heads I, secured to thepiston-rod D, with which it has a reciprocating motion from end to endof the chamber K through the bridge I. This piston is made hollow forthe purpose of reducin g its specific gravity, which, if the piston weremade solid, would soon wear the under side thereof and the adjacent partof the bridge out of true, which would interfere materially with theperfect working of the pump; but as it is well known that a pistonconstructed as described would, under pressure, gradually become filledwith water forced through its walls,

I insert within said piston another closed cylinder, m, of a littlesmaller diameter, and secure it in such a manner as to leave a smallannular space, a, between the walls of the piston and the cylinder, andextending to a corresponding space between one of the heads of thepiston and the end of the cylinder. The piston-rod D is provided with achannel, 0, extending to and communicating with this space n, and in theopposite direction outside the stuffing-box C. Now, as under pressurethe water is forced through the walls of the pissten, the space n limitsthe quantity so as not materially to interfere with the specific gravityof the piston, and the small amount of water admitted, not being underpressure after its admission, does not pass through the walls of theinternal cylinder, and is readily drawn oil through the orifice in thepiston-rod.

In practice, the piston being in the position shown in Fig. 1 and thepump in operation, the water displaced in the chamber K is forced outthrough the valves J into the chamber M, while the water admittedthrough the suction or inlet E fills the chamber Q and enters thatportion of the chamber K in which the piston is not found, through thevalves J, and as the piston travels to the opposite end of the chamher alike action of expulsion and admission takes place at the end of thechamber from which the piston has just passed.

By locating the opening to the vacuum-chamber directly opposite theinlet-opening E a constant flow of water is had without the pulsationsusually found in the discharge of water from pumps as ordinarilyconstructed, for the suction of water into the vacuum'chamber willprevent such pulsations, which always occur at and near the end of thestroke of the piston.

What 1 claim as my invention is- 1. In a pump, the shell A, providedwith illlet and outlet pipes and vacuum and airehamher, as described, incombination with the annular support I, the ring-sections H H, thevalve-rings L, the rigid flanges c 0, and the piston P, substantially asand for the purpose specified.

2. In a hollow plunger, and in combination therewith, a tight cylinderlocated within said hollow plunger, leaving a small annular spacebetween it and the walls of the plunger, and a drip through theplunger-rod, all arranged for the purpose of reducing the bulk of thewater which may be pressed into the hollow plunger, and allowing it tofind its way out through the drip in the piston, substantially asdescribed,

3. In a displacement-pump, and in combination, the chambers K, M,and Q,the latter having an inward communication with the former through ports0, and the chamber M having an outward communication with the chamber Kthrough ports 0', all of said parts being provided with valves,substantially as set forth.

4. In a pump, a pump-barrel within which the piston has a reciprocatingmotion, formed of the perforated valve-rin gs H, perforated "alve-ringsL, and heads B, the perforations in said rings being provided withvalves, which, in the reciprocation of the piston, alternately close anddisclose the ports, substantially as and for the purposes specified.

5. In a pump, the ring and valve sections H L, provided with recesses gg, in combination with the valves and ports of said ring and valvesections. substantially as and for the purpose specified.

6. In a pump, the ring and valve sections H L, provided with a circularseries of openings, 6 t, recesses g g, and elastic valves J J, eachvalve being constructed to answer for a series of openings on each sideof the recesses g g, substantially as described.

4 MIOIAH WALKER.

Witnesses:

L. ATKINS, WM. H. AVERY.

